High temperatures cause conductors to expand and hence increase in length. The converse is true for low temperature conditions. The change in length varies from one conductor to another depending on its thermal expansivity. The length of copper conductors, for instance, changes by 5 feet per 1000 feet of length when the conductor temperature changes from 100 – 0°, while aluminum changes by about 7 feet. The length increases with increase in temperature and reduces with reduction in temperature.

This increase or decrease in length is of great concern when installing power transmission lines between poles and towers, or when installing other power connectors. There must be an allowance for this change in length since it can cause catastrophes if it’s not there.

Weather changes are associated with increase and decrease in temperature and thus affect power transmission lines and other conductors. However, change in temperature is only one factor that affects power lines. Below are the changes that occur to power lines and other conductors as a result of weather changes:

The amount of heat dissipated from power conductors is reduced during hot and calm weather conditions. Basically, if the temperature of air around the cable is low, more heat is lost from the cable to the air. If the air is already hot, the exchange of heat is lesser. This low heat dissipation causes the lines to overheat. However, the rise in conductor temperature (overheating) worsens when cables are transmitting too much power than required. The first effect of this increased conductor temperature is snagging, which is the downward bulging of the cable between two poles, caused by the increase in the length of cables.

Snagging is largest during extreme hot weather (largest increase in temperature) conditions experienced in summer. The increase in length results to downward bulging of the cable due to the effect of gravity. Excessive sagging is dangerous if it goes below the accepted height clearance – cables could come into contact with trees, buildings and other structures underneath, causing electrocution and fires.

Excessive sagging represent an added weight on the power line and this increase may cause the line to fail or to pull down weak poles and towers. The effects can be small but gradual and so the poles and towers will finally come down or require some adjustment/replacement after some time, which is costly. This sagging can also cause the lines to short out. Excessive sagging is also costly since it leads to increased electrical resistance. This means that a sagged power line transmits lesser current than it normally does, thus causing under-feeding of electrical equipment and industries. It is also costly and time consuming to rectify a sag.

Electricians. Maybe not the most glamorous of professions, but certainly a necessary one! What would we do without them?

The answer? Not much.

Electricians are responsible for installing and maintaining the complex electrical systems that bring power and light to our lives. Without electricians, we’d all be living in the dark! No computers, no telephones, nada.

Electricians come in many types. For example, there are:

-> Linemen, the guys you see out working the wires on the side of I80, in a snowstorm at the Utah / Wyoming line

-> Wiremen, the guys who work in office buildings, hospitals, and private homes.

They have ranks, too. There are:

-> Apprentice Electricians – least experienced of all, the role of the apprentice is to learn the trade under the guidance of experienced and accomplished electricians.

-> Journeymen Electricians – more experienced, journeymen electricians have successfully completed their apprenticeships and have been found competent by a licensing authority.

-> Master Electricians – most experienced, master electricians generally have more than 7 years experience and have passed an advanced examination covering the National Electric Code, or NEC.

So how’s the job market for electricians? Amazingly great! The Bureau of Labor Services predicts a 23% increase in openings for qualified electricians between 2010 and 2020. And the pay’s not bad either! Electricians make, on average, $23.50 per hour, or approximately $50,000 per year. You don’t need go to college to become an electrician, but an apprenticeship of several years is required.

Is it dangerous work? Of course! Working with electricity, one of the most potent forces of nature, is always going to be dangerous. That’s why it’s so important to contact a qualified electrician if you suspect problems with your electrical system. Professional, licensed, and insured, a qualified and competent electrician is a must for any electrical project, no matter how small.

photo courtesy of moviewritemyu.wordpress.com

“The first rooftop celebration atop One Times Square, complete with fireworks display, took place in 1904.*

Don’t let this New Year’s Eve slip away without a proper celebration.  Whether you are quietly reminiscing with a loved one over dinner or out on the town in the midst of noisemakers and confetti–see yourself in the best of light and make 2015 your brightest year yet.  New chandeliers, table lamps and wall lights are a marvel with outstanding and energy-wise light sources and intriguing configurations.

“CHIMERA” WALL SCONCE FROM CORBETT

“URBAN NIGHTS” FROM MAXIM

“RING O” FROM VAN TEAL

“GATHERING” FROM VAN TEAL

“RAVENNA” FOYER PENDANT FROM HINKLEY LIGHTING

See the the latest portable lamps, chandeliers and decorative accessories at 1800lighting.com. Stay tuned for the latest introductions from the Dallas Market January 2015.  Visit a Capitol Lighting showroom or 1800lighting.com for expert advice and a complimentary lighting plan for a new year of inspiring illumination.

*wikipedia.com

Most people have experienced a circuit breaker trip at some time or the other; and the first couple of times it happens, it can be quite alarming. However, this is a very important safety component in any electrical circuit. A circuit breaker is essentially an automatic device used to stop the flow of current within a circuit, as a safety measure. It is specifically designed to protect your property, equipment in your home/commercial space and you from overloading the electrical circuit.

The sole reason a circuit breaker trips is to prevent the overheating and overloading of an electrical circuit, beyond the capacity of that circuit. If there is no breaker in place, the electrical units in that circuit can get damaged and potentially lead to a fire.

In case a circuit breaker trips, the very first thing to do is to locate it in your panel box. The switch you are looking for is the one that isn’t completely in an On/Off position. Once you turn the switch into the ‘on’ position, the power will be restored. In case the power doesn’t come on, simply switch it off and then on again.

If the circuit breaker trips even after you have reset it, don’t just try resetting it again. It’s doing what it’s designed to do and telling you that there is something wrong that has to be investigated. There are three different things that can cause a circuit breaker to trip:

This is the commonest cause of a circuit breaker trip. It occurs when the electrical energy that’s flowing through the circuit is much more than what it can handle. The simplest way to solve this problem is to redistribute the power to some other circuits. Very simply put, in case too many heavy appliances are connected to a single circuit, move a couple of them to one that isn’t as loaded.

It’s important that you check whether the circuits aren’t loose. First, switch off the power and look for any loose wires; you can do this by closely inspecting the hot wires and outlets that lead from the service panel to the circuit breaker, and then tighten the connection that’s loose.

If after checking the circuit overload, you find there aren’t any issues in that areas, the problem could be a short circuit. This is caused when any live wire touches another neutral/live wire. At times a short circuit may be caused by a broken wire within the breaker. It’s far more difficult to identify this as it could be just about any part of the wiring system which is connected to that circuit. At times, the culprit could be an appliance that’s plugged into an outlet.

This issue is quite a dangerous and severe one and it’s important that it be diagnosed quickly. It can be quite tedious to look for a short circuit and the outlets, plugs and wiring that are connected to that circuit, but these checks are important. Look for cracks or signs of burning in the insulation and call an electrician without delay.

If it’s neither a short circuit nor a circuit overload that’s caused the circuit breaker to trip, it could be a ground fault issue. This happens when any hot wire touches the metal outlet box or the ground wire.

If a circuit breaker trips in your home or commercial property, keep in mind that it’s a very serious issue and not something that should be ignored. For the best electrical solutions, call Allround Electrical at 1300 169 263. You can also drop us a line via email or contact us through this online form.

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